The plots on the right of fig:matchplot show the matches but with the addition of memory to both the waveform templates. We find that lines of constant match are generally shifted towards the bottom right compared to the plots on the left. This is as anticipated, since systems that are tidally disrupted have much less memory amplitude compared to a corresponding BBH system. Moreover, we see that adding memory especially improves the distinguishablility for small values of \(\Lambda _\mathrm {NS}\)  in almost equal mass binaries. Measured values of \(\Lambda _\mathrm {NS}\)  from the observation of GW170817 [1]}, which had a mass ratio of less than 1.5, show support for \(\Lambda _\mathrm {NS}\)  around 300 and \(\Lambda _\mathrm {NS}\lessapprox 600\)  for even the broadest prior [2]}, this is the region of \(\Lambda _\mathrm {NS}\)  where memory contributes the most for increasing the distinguishablity. This is due to the fact that if one companion is a NS, these systems are likely to be disrupted, producing a dip in memory, whereas if both are BHs the memory amplitude benefits from the equal masses and peaks.
As displayed in fig:matchplot the improvement in mismatch for advanced LIGO is only small, but still noticeable and in a quite interesting part of the parameter space. The mismatch will become more pronounced in future detectors since these will be not only more sensitive overall, but also are expected to be especially more sensitive towards lower frequencies.
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